Consider the equation 2 H2 + O2 → 2 H2O, what does the 2 in the coefficient of H2O molecule represent?(a) number of particles(b) the number of molecules(c) number of moles(d) number of atomsThis question was addressed to me in a job interview.Query is from Thermodynamics in division Thermodynamics of Chemistry – Class 11

Consider the equation 2 H2 + O2 → 2 H2O, what does the 2 in the coef

1.	Consider the equation 2 H2 + O2 → 2 H2O, what does the 2 in the coefficient of H2O molecule represent?(a) number of particles(b) the number of molecules(c) number of moles(d) number of atomsThis question was addressed to me in a job interview.Query is from Thermodynamics in division Thermodynamics of Chemistry – Class 11
Answer» The CORRECT choice is (c) number of moles The EXPLANATION is: In a balanced thermochemical equation, the coefficients always REFER to the number of the moles (but never molecules) of reactants and products involved in a REACTION so 2 in the COEFFICIENT of H2O refers to the number of the moles of water.

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